Ah yes, the lockability of the 1974 Kombi.
Manual key only, and really any VW key will probably get you in.
Managed to get the locks re keyed from purchase time so that barrels were all new, and the correct key was required.

Again, I'm more concerned about theft from the van than the whole thing.
Bought a lockable tool box, chanied it to the back seat.

Valuables go in that, locked up, locked to the seat base.
Again, It's a slow down ploy only, but the bad guy will have to be carrying a substantial set of bolt cutters to get in to it.
Only key that starts the car goes with me.Van is well insured in case the worst happens.
I suspect Louise and gabe are less paranoid and just hide stuff, take the key with them.